Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed452d6c85bc3a65…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5df547fb4ac092e6d976bcc9ae471df6 SHA-1: b21e863f06c6e790f7bf09e7a0ab4143ba73baec SHA-256: ed452d6c85bc3a6595b300dab97ca652a876685ac8dee4bbe14bd01a4d2890e8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malware. The presence of 'invoice' or 'payment' language, combined with a 'download button' lure, indicates a phishing attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bosgo.mn/uploads/files/vijifob.pdf In PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8da46d9d27723a236cd9b610a5666e6d/3203363643.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/1172931450.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/vipodugilivorapumefi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/55736610004.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/89158469259.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/j40bvffurubksgm6er75c8i4bs/67748684447.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3da69028---79107746300.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/raziga.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xomapotaburomijinefo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/ca59824dd8f3338993577d83da17032b/mamivomagixopubugureduvog.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a89784a47e4---65877737482.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c804ca5d0---tebelixidutuvugegazer.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/87674347949.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/gexameledokivu.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/siwuwapanosup.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zugigori.pdfIn PDF document text
    • http://azizolace.cz/images/file/papagalutadibipi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/250a0c37a3297e33f087e509cf4254de/52380603548.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c23ef20073f---sijipu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/buduzuvanutojesitepuvo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ara6mipsfv2aiqg3rmdm3k9f84/duwemubi.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/xubapiwisosuvogovo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9e47a7b494992b906c7fa2273c39010/87206181411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=daily+account+book+format+in+excelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10876 bytes
SHA-256: 103f10c8910c001f50300fcb9bcef9845553f55bd3a22e4df49a94e2ab715f06
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16896 bytes
SHA-256: 2535595a2f171db0bea02c69b5d2500c627d26651a4b1caed59f2a9d9a97a24e

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